Change Next-Hop in BGP neighbours advertise routes

General questions
,
1

Hi everyone,
I want to know how can I change next-hop in BGP neighbours advertise routes.

admin@vFW01:~$ show ip bgp neighbors 10.0.0.254 advertised-routes
BGP table version is 22, local router ID is x.x.x.x, vrf id 0
Default local pref 100, local AS 65152
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 10.0.0.0/20      10.0.0.254                             0 65152 i
*> 10.0.16.0/20     10.0.0.254                             0 65152 i
*> 10.0.32.0/20     10.0.0.254                             0 65152 i
*> 10.64.0.0/12     0.0.0.0                  0         32718 i
*> 10.200.81.0/24   0.0.0.0                  0         32718 i
*> 10.237.0.0/16    0.0.0.0                  0         32718 i
*> 10.237.90.0/24   0.0.0.0                  0         32718 i
*> 10.240.0.0/21    0.0.0.0                  0         32718 i

I wanna change for 10.240.0.0/21 from 0.0.0.0 to 10.0.0.254

2

Those routes originated from your router.
So next hop will be your router.